/**
   * Returns a copy of the input string in which all {@linkplain #isUpperCase(char) uppercase ASCII
   * characters} have been converted to lowercase. All other characters are copied without
   * modification.
   */
  public static String toLowerCase(String string) {
    int length = string.length();
    for (int i = 0; i < length; i++) {
      if (isUpperCase(string.charAt(i))) {
        char[] chars = string.toCharArray();

    }
    return dummy;
  }

  @Benchmark
  boolean isUpperCase(int reps) {
    // This benchmark has no concept of "noWorkToDo".
    char[] chars = testString.toCharArray();

    boolean dummy = false;
    for (int i = 0; i < reps; i++) {
      for (int n = 0; n < chars.length; n++) {
        dummy ^= Ascii.isUpperCase(chars[n]);
      }
    }
    return dummy;
  }

      assertFalse(str, Ascii.isUpperCase(c));
    }
  }

  public void testCharsLower() {
    for (char c : LOWER.toCharArray()) {
      String str = String.valueOf(c);
      assertTrue(str, c == Ascii.toLowerCase(c));
      assertFalse(str, c == Ascii.toUpperCase(c));
      assertTrue(str, Ascii.isLowerCase(c));
      assertFalse(str, Ascii.isUpperCase(c));
    }
  }

  public void testCharsUpper() {

      assertFalse(str, Ascii.isUpperCase(c));
    }
  }

  public void testCharsLower() {
    for (char c : LOWER.toCharArray()) {
      String str = String.valueOf(c);
      assertTrue(str, c == Ascii.toLowerCase(c));
      assertFalse(str, c == Ascii.toUpperCase(c));
      assertTrue(str, Ascii.isLowerCase(c));
      assertFalse(str, Ascii.isUpperCase(c));
    }
  }

  public void testCharsUpper() {

  @Deprecated
  public static CharMatcher javaLetterOrDigit() {
    return JavaLetterOrDigit.INSTANCE;
  }

  /**
   * Determines whether a BMP character is upper case according to {@linkplain
   * Character#isUpperCase(char) Java's definition}.
   *
   * @deprecated Some uppercase characters are supplementary characters; see the class
   *     documentation.
   * @since 19.0 (since 1.0 as constant {@code JAVA_UPPER_CASE})
   */

     */
    protected boolean containsUppercase(final String password) {
        for (int i = 0; i < password.length(); i++) {
            if (Character.isUpperCase(password.charAt(i))) {
                return true;
            }
        }
        return false;
    }

    /**
     * Checks if the password contains at least one lowercase letter.
     *